EP3403326A1 - Vacuum pump drive having two frequency converters - Google Patents

Vacuum pump drive having two frequency converters

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Publication number
EP3403326A1
EP3403326A1 EP16819936.2A EP16819936A EP3403326A1 EP 3403326 A1 EP3403326 A1 EP 3403326A1 EP 16819936 A EP16819936 A EP 16819936A EP 3403326 A1 EP3403326 A1 EP 3403326A1
Authority
EP
European Patent Office
Prior art keywords
frequency converter
motor
frequency
vacuum pump
input voltage
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Withdrawn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
EP16819936.2A
Other languages
German (de)
French (fr)
Inventor
Sebastian Walzel
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.)
Leybold GmbH
Original Assignee
Leybold GmbH
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 Leybold GmbH filed Critical Leybold GmbH
Publication of EP3403326A1 publication Critical patent/EP3403326A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
    • H02P23/26—Power factor control [PFC]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • F04B49/065—Control using electricity and making use of computers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/047—V/F converter, wherein the voltage is controlled proportionally with the frequency

Definitions

  • the invention relates to an electric drive for a vacuum pump.
  • Electric drives for vacuum pumps typically include an electric motor that generates the torque required to drive the rotor of the vacuum pump in response to the motor input voltage to the motor.
  • the motor input voltage variable frequency and voltage is thereby generated by a frequency converter, which is fed from a power supply network with a mains supply voltage.
  • the power loss occurring in the electric motor is an important design criterion.
  • the amount of power loss determines the potential performance of the vacuum pump. For a given construction volume for the pump drive the lowest possible power loss with the highest possible mechanical power of the engine should be achieved.
  • the invention has for its object to provide an electromotive vacuum pump drive with two frequency converters, which can be synchronized in a simpler way to reduce the power loss of the electric motor.
  • the vacuum pump drive according to the invention is defined by the features of claim 1.
  • the second frequency is provided with a measuring device which is adapted to detect the generated by the first frequency converter input voltage of the electric motor and / or generated by the first frequency converter motor current for the electric motor.
  • the second frequency converter is configured to generate the motor input voltage as a function of the signal measured by the measuring device, in order thereby to be operated in synchronism with the first frequency converter.
  • the invention thus enables a simplified synchronization of the motor input voltages generated by the two frequency converters, without a direct data connection between the two frequency converters or between their respective control units for synchronization of the frequency converter is required.
  • a data connection is not present between the frequency converters for their synchronization.
  • the first frequency converter generates a variable motor input voltage with adjustable frequency.
  • the electric motor generates drive torque for driving the vacuum pump rotor in response to the motor input voltage.
  • the first frequency converter receives no information about the output voltage of the second frequency converter - neither via a connecting line between the frequency converters, nor via a measuring device.
  • the measuring device is designed to generate the motor input voltage generated by the first frequency converter and / or that of the first frequency converter Frequency converter generated motor input current to capture.
  • the measuring device is electrically or electronically or optically connected to the second frequency converter, preferably to a control unit of the second frequency converter, in order to transmit a measuring signal to the second frequency converter, from which determines the frequency and the height of the motor input voltage or the motor input current of the first frequency can be.
  • the second frequency converter preferably its control unit, is designed to generate a motor input voltage as a function of the determined output voltage generated by the first frequency converter whose frequency and magnitude are adapted (synchronized) to the measured motor voltage.
  • the motor input voltage generated by the first frequency converter is applied at one end of the electric windings of the electric motor, while the motor input voltage of the second frequency converter is applied to the opposite ends of the motor windings.
  • the two frequency converters according to the invention can also be designed to drive a plurality of electric motors and be connected to them.
  • at least one further frequency converter is provided, which is also synchronized via the measuring device of the second frequency in each case likewise with the first frequency converter.
  • each additional frequency converter may have its own measuring device to enable synchronous operation with the first frequency converter or another preceding frequency converter.
  • a third frequency converter can be synchronized with the second frequency converter via its own measuring device.
  • the electric motor of the vacuum pump drive is shown schematically as a block with the reference numeral 12.
  • the motor windings of the three phases U, V, W are shown.
  • the one, in the figure left end of the motor windings is connected via a three-phase electrical connection line 14 to a first frequency converter 16.
  • the opposite, in the figure, right end of the motor windings is connected via a separate electrical three-phase connecting line to a second frequency converter 18.
  • Each of the two frequency converters 16, 18 has its own control unit 20, 22. Neither between the two frequency converters 16, 18 nor between the two control units 20, 22 is a data connection.
  • Both frequency converters 16, 18 each have six transistors, of which two are each assigned to one of the three motor phases U, V, W. In other words, in each case two first transistors with the first motor phase U, two second transistors with the second motor phase V and two third transistors with the third motor phase W are electrically connected. All transistors are electrically connected to the supply voltage of a voltage supply network, not shown in the figure. In addition, all the transistors of the first frequency converter 16 are connected to the control unit 20 and all the transistors of the second frequency converter 18 are connected to the second control unit 22.
  • a measuring device 24 is arranged, which generated by the first frequency converter 16 in the connecting line 14 Motor input voltage and / or measured by the first frequency converter 16 in the electrical connection line 14 generated motor input current and / or the motor input voltage measures.
  • the measuring device 24 is connected to the control unit 22 via a measuring line 26 in order to transmit the measuring signal, which contains information about the frequency and magnitude of the motor input voltage and / or the motor current in the line 14, to the control unit 22 of the second frequency converter 18.
  • the frequency converter 18 with the control unit 22 is designed to generate a motor input voltage in the connecting line 14 as a function of the measuring signal of the measuring device 24. Characterized the voltage applied in the connecting line 14 between the second frequency converter 18 and electric motor 12 motor input voltage of the second frequency converter 18 is synchronized with the applied in the connecting line 14 between the first frequency converter 16 and electric motor 12 motor input voltage of the first frequency converter 16.
  • each of the two frequency converters 16, 18 generates its own, applied to a respective end of the motor windings of the electric motor 12 motor input voltage.
  • the first frequency converter 16 has no information about the output voltage of the second frequency converter 18.
  • the second frequency converter 18 has the information which motor input voltage of the first frequency converter 16 is generated by the measuring device 24.
  • the power loss resulting in the electric motor can be reduced.
  • the electric motor 12 is connected so that at a given supply voltage of the respective frequency converter 16, 18, a higher motor input voltage than in the conventional interconnection is generated.
  • the frequency converter 16 is a conventional frequency converter or inverter for controlling an electric motor and includes the control or. Control structure for controlling and regulating the electric motor.
  • the peculiarity of the invention is that there is no data connection between the two control units 20, 22 for the synchronization of the frequency converters 16, 18. It can only be a connection for other purposes, such as status tracking and error handling.
  • the synchronization of the second frequency converter 18 to the rotating field of the first frequency converter 16 is made possible by means of the measuring device 24 connected to the electric motor.
  • the measuring device 24 does not consist of a mechanical speed or position encoder system but exclusively of a measuring system of the electrical actual values of the voltage and / or the current in the connecting line 14 on the electric motor 12.
  • the inventive interconnection of the two frequency converters 16, 18 whose output voltage can be increased up to 57 percent at the same power supply voltage with standard components (frequency converter, measuring device 24). This allows a design of the electric motor 12 to a higher motor voltage or a reduction of the power loss in the electric motor 12 with the same drive power.

Abstract

The invention relates to a vacuum pump drive comprising an electric motor (12) driving the rotor of a vacuum pump, a first frequency converter (16) connected to the electric motor (12) and designed to generate a motor input voltage for driving the electric motor (12) from a network supply voltage, at least one second frequency converter (18) that is also designed to generate a motor input voltage of a variable frequency from a network supply voltage, in order to drive the motor according to the frequency of the motor input voltage, characterised in that the second frequency converter (18) is provided with a measuring device (24), which is provided for measuring the motor input voltage generated by the first frequency converter (16) and/or the related motor input current, in order to synchronise the second frequency converter (18) with the first frequency converter (16).

Description

Vakuumpumpenantrieb mit zwei Frequenzumrichtern  Vacuum pump drive with two frequency converters
Die Erfindung betrifft einen elektrischen Antrieb für eine Vakuumpumpe. The invention relates to an electric drive for a vacuum pump.
Elektrische Antriebe für Vakuumpumpen weisen typischerweise einen Elektromotor auf, der das für den Antrieb des Rotors der Vakuumpumpe erforderliche Drehmoment in Abhängigkeit von der den Motor versorgenden Motoreingangsspannung erzeugt. Die Motoreingangsspannung mit variabler Frequenz und Spannung wird dabei von einem Frequenzumrichter erzeugt, der aus einem Spannungsversorgungsnetz mit einer Netzversorgungsspannung gespeist wird. Bei dem elektrischen Antrieb von Vakuumpumpen ist die im Elektromotor entstehende Verlustleistung ein wichtiges Auslegungskriterium. Die Höhe der Verlustleistung bestimmt die mögliche Leistungsfähigkeit der Vakuumpumpe. Bei gegebenem Bauvolumen für den Pumpenantrieb soll eine möglichst geringe Verlustleistung bei möglichst hoher mechanischer Leistung des Motors erreicht werden. Electric drives for vacuum pumps typically include an electric motor that generates the torque required to drive the rotor of the vacuum pump in response to the motor input voltage to the motor. The motor input voltage variable frequency and voltage is thereby generated by a frequency converter, which is fed from a power supply network with a mains supply voltage. In the electric drive of vacuum pumps, the power loss occurring in the electric motor is an important design criterion. The amount of power loss determines the potential performance of the vacuum pump. For a given construction volume for the pump drive the lowest possible power loss with the highest possible mechanical power of the engine should be achieved.
Hierzu ist es bekannt, den Elektromotor eines Pumpenantriebs mit zwei Frequenzumrichtern zu betreiben, wobei die Frequenzumrichter miteinander synchronisiert werden. Der eine Frequenzumrichter ist dabei mit dem einen Ende der Motorwicklungen verbunden und der andere Frequenzumrichter ist mit den gegenüberliegenden Enden der Motorwicklungen verbunden. For this purpose, it is known to operate the electric motor of a pump drive with two frequency converters, wherein the frequency converter are synchronized with each other. The one frequency converter is connected to one end of the motor windings and the other frequency converter is connected to the opposite ends of the motor windings.
Zur Synchronisation der beiden Frequenzumrichter weisen diese miteinander verbundene Steuereinheiten auf, um Daten zur Synchronisation der Frequenzumrichter auszutauschen. Ein derartiger Synchronantrieb mit zwei Frequenzumrichtern ist beispielsweise beschrieben in "DTC of Open-End Winding Induction Motor Drive Using Space Vector Modulation With Reduced Switching Frequency", A. Kumar, B.G. Fernandes, K. Chatterjee, 2004 35th Annual IEEE Power Electronics Specialists Conference, Aachen, Germany, 2004. To synchronize the two frequency converters have these interconnected control units to exchange data for synchronization of the frequency converter. Such a synchronous drive with two frequency converters is described, for example, in "DTC of Open-End Winding Induction Motor Drive Using Space Vector Modulation With Reduced Switching Frequency", A. Kumar, B.G. Fernandes, K. Chatterjee, 2004 35th Annual IEEE Power Electronics Specialists Conference, Aachen, Germany, 2004.
Alternativ ist es zur Synchronisation der beiden Frequenzumrichter bekannt, diese mit nur einer gemeinsamen, beide Frequenzumrichter ansteuernden Steuereinheit zu betreiben. Alternatively, it is known for the synchronization of the two frequency converter to operate them with only one common, both frequency converter controlling control unit.
Der Erfindung liegt die Aufgabe zugrunde, einen elektromotorischen Vakuumpumpenantrieb mit zwei Frequenzumrichtern zu schaffen, die auf einfachere Weise synchronisierbar sind, um die Verlustleistung des Elektromotors zu reduzieren. Der erfindungsgemäße Vakuumpumpenantrieb ist definiert durch die Merkmale von Anspruch 1. The invention has for its object to provide an electromotive vacuum pump drive with two frequency converters, which can be synchronized in a simpler way to reduce the power loss of the electric motor. The vacuum pump drive according to the invention is defined by the features of claim 1.
Demnach ist der zweite Frequenzumrichter mit einer Messeinrichtung versehen, die dazu ausgebildet ist, die von dem ersten Frequenzumrichter generierte Motoreingangsspannung des Elektromotors und/oder den von dem ersten Frequenzumrichter generierten Motorstrom für den Elektromotor zu erfassen. Der zweite Frequenzumrichter ist dazu ausgebildet, die Motoreingangsspannung in Abhängigkeit von dem von der Messvorrichtung gemessenen Signal zu generieren, um dadurch synchron zu dem ersten Frequenzumrichter betrieben zu werden. Die Erfindung ermöglicht also eine vereinfachte Synchronisation der von den beiden Frequenzumrichtern generierten Motoreingangsspannungen, ohne dass eine direkte Datenverbindung zwischen den beiden Frequenzumrichtern beziehungsweise zwischen deren jeweiligen Steuereinheiten zur Synchronisation der Frequenzumrichter erforderlich ist. Vorzugsweise ist eine solche Datenverbindung zwischen den Frequenzumrichtern zu deren Synchronisation nicht vorhanden. Es ist insbesondere auch keine gemeinsame, beide Frequenzumrichter ansteuernde Steuereinheit vorgesehen. Vielmehr weist jeder Frequenzumrichter eine eigene Steuereinheit auf, zwischen denen keine Daten zur Synchronisation der Frequenzumrichter ausgetauscht werden. Accordingly, the second frequency is provided with a measuring device which is adapted to detect the generated by the first frequency converter input voltage of the electric motor and / or generated by the first frequency converter motor current for the electric motor. The second frequency converter is configured to generate the motor input voltage as a function of the signal measured by the measuring device, in order thereby to be operated in synchronism with the first frequency converter. The invention thus enables a simplified synchronization of the motor input voltages generated by the two frequency converters, without a direct data connection between the two frequency converters or between their respective control units for synchronization of the frequency converter is required. Preferably, such a data connection is not present between the frequency converters for their synchronization. In particular, there is also no common control unit which activates both frequency inverters. Rather, each frequency converter has its own control unit, between which no data for synchronization of the frequency converter are exchanged.
Der erste Frequenzumrichter generiert eine variable Motoreingangsspannung mit einstellbarer Frequenz. Der Elektromotor erzeugt ein Antriebsdrehmoment zum Antrieb des Vakuumpumpenrotors in Abhängigkeit von der Motoreingangsspannung. Der erste Frequenzumrichter erhält dabei keinerlei Informationen über die Ausgangsspannung des zweiten Frequenzumrichters - weder über eine Verbindungsleitung zwischen den Frequenzumrichtern, noch über eine Messeinrichtung. The first frequency converter generates a variable motor input voltage with adjustable frequency. The electric motor generates drive torque for driving the vacuum pump rotor in response to the motor input voltage. The first frequency converter receives no information about the output voltage of the second frequency converter - neither via a connecting line between the frequency converters, nor via a measuring device.
Die Messeinrichtung ist dazu ausgebildet, die von dem ersten Frequenzumrichter generierte Motoreingangsspannung und/oder den von dem ersten Frequenzumrichter generierten Motoreingangsstrom zu erfassen. Die Messeinrichtung ist dabei elektrisch beziehungsweise elektronisch oder optisch mit dem zweiten Frequenzumrichter, vorzugsweise mit einer Steuereinheit des zweiten Frequenzumrichters, verbunden, um ein Messsignal an den zweiten Frequenzumrichter zu übertragen, aus welchem die Frequenz und die Höhe der Motoreingangsspannung oder des Motoreingangsstroms des ersten Frequenzumrichters ermittelt werden kann. Der zweite Frequenzumrichter, vorzugsweise dessen Steuereinheit, ist dazu ausgebildet, in Abhängigkeit von der ermittelten, von dem ersten Frequenzumrichter generierten Ausgangsspannung eine Motoreingangsspannung zu generieren, deren Frequenz und Höhe an die gemessene Motorspannung angepasst (synchronisiert) ist. The measuring device is designed to generate the motor input voltage generated by the first frequency converter and / or that of the first frequency converter Frequency converter generated motor input current to capture. The measuring device is electrically or electronically or optically connected to the second frequency converter, preferably to a control unit of the second frequency converter, in order to transmit a measuring signal to the second frequency converter, from which determines the frequency and the height of the motor input voltage or the motor input current of the first frequency can be. The second frequency converter, preferably its control unit, is designed to generate a motor input voltage as a function of the determined output voltage generated by the first frequency converter whose frequency and magnitude are adapted (synchronized) to the measured motor voltage.
Die von dem ersten Frequenzumrichter generierte Motoreingangsspannung liegt dabei an dem einen Ende der elektrischen Windungen des Elektromotors an, während die Motoreingangsspannung des zweiten Frequenzumrichters an den gegenüberliegenden Enden der Motorwicklungen anliegt. The motor input voltage generated by the first frequency converter is applied at one end of the electric windings of the electric motor, while the motor input voltage of the second frequency converter is applied to the opposite ends of the motor windings.
Insbesondere können die beiden erfindungsgemäßen Frequenzumrichter zusammen mit der erfindungsgemäßen Messvorrichtung auch zum Antrieb mehrerer Elektromotoren ausgebildet und mit diesen verbunden sein. Zudem ist denkbar, dass zusätzlich zu dem zweiten Frequenzumrichter mindestens ein weiterer Frequenzumrichter vorgesehen ist, der über die Messeinrichtung des zweiten Frequenzumrichters jeweils ebenfalls mit dem ersten Frequenzumrichter synchronisiert wird. Alternativ kann jeder weitere Frequenzumrichter eine eigene Messvorrichtung aufweisen, um einen Synchronbetrieb mit dem ersten Frequenzumrichter oder einem anderen vorangehenden Frequenzumrichter zu ermöglichen. Hier kann beispielsweise ein dritter Frequenzumrichter über eine eigene Messeinrichtung mit dem zweiten Frequenzumrichter synchronisiert werden. Im Folgenden wird anhand der Figur ein Ausführungsbeispiel der Erfindung näher erläutert. Die Figur zeigt eine schematische Schaltung des Ausführungsbeispiels. In particular, the two frequency converters according to the invention, together with the measuring device according to the invention, can also be designed to drive a plurality of electric motors and be connected to them. In addition, it is conceivable that in addition to the second frequency converter at least one further frequency converter is provided, which is also synchronized via the measuring device of the second frequency in each case likewise with the first frequency converter. Alternatively, each additional frequency converter may have its own measuring device to enable synchronous operation with the first frequency converter or another preceding frequency converter. Here, for example, a third frequency converter can be synchronized with the second frequency converter via its own measuring device. In the following an embodiment of the invention will be explained in more detail with reference to FIG. The figure shows a schematic circuit of the embodiment.
Der Elektromotor des Vakuumpumpenantriebs ist schematisch als Block mit dem Bezugszeichen 12 versehen dargestellt. Zur Veranschaulichung sind in dem den Elektromotor 12 darstellenden Block die Motorwicklungen der drei Phasen U, V, W dargestellt. The electric motor of the vacuum pump drive is shown schematically as a block with the reference numeral 12. By way of illustration, in the block representing the electric motor 12, the motor windings of the three phases U, V, W are shown.
Das eine, in der Figur linke Ende der Motorwicklungen ist über eine elektrische drei-Phasen-Verbindungsleitung 14 mit einem ersten Frequenzumrichter 16 verbunden. Das gegenüberliegende, in der Figur rechte Ende der Motorwicklungen ist über eine separate elektrische drei-Phasen- Verbindungsleitung mit einem zweiten Frequenzumrichter 18 verbunden. Jeder der beiden Frequenzumrichter 16, 18 weist eine eigene Steuereinheit 20, 22 auf. Weder zwischen den beiden Frequenzumrichtern 16, 18 noch zwischen den beiden Steuereinheiten 20, 22 besteht eine Datenverbindung. The one, in the figure left end of the motor windings is connected via a three-phase electrical connection line 14 to a first frequency converter 16. The opposite, in the figure, right end of the motor windings is connected via a separate electrical three-phase connecting line to a second frequency converter 18. Each of the two frequency converters 16, 18 has its own control unit 20, 22. Neither between the two frequency converters 16, 18 nor between the two control units 20, 22 is a data connection.
Beide Frequenzumrichter 16, 18 weisen jeweils sechs Transistoren auf, von denen jeweils zwei einer der drei Motorphasen U, V, W zugeordnet sind. Das heißt mit anderen Worten, dass jeweils zwei erste Transistoren mit der ersten Motorphase U, zwei zweite Transistoren mit der zweiten Motorphase V und zwei dritte Transistoren mit der dritten Motorphase W elektrisch verbunden sind. Sämtliche Transistoren sind dabei elektrisch mit der Versorgungsspannung eines in der Figur nicht dargestellten Spannungsversorgungsnetzes verbunden. Darüber hinaus sind sämtliche Transistoren des ersten Frequenzumrichters 16 mit der Steuereinheit 20 verbunden und sämtliche Transistoren des zweiten Frequenzumrichters 18 sind mit der zweiten Steuereinheit 22 verbunden. Both frequency converters 16, 18 each have six transistors, of which two are each assigned to one of the three motor phases U, V, W. In other words, in each case two first transistors with the first motor phase U, two second transistors with the second motor phase V and two third transistors with the third motor phase W are electrically connected. All transistors are electrically connected to the supply voltage of a voltage supply network, not shown in the figure. In addition, all the transistors of the first frequency converter 16 are connected to the control unit 20 and all the transistors of the second frequency converter 18 are connected to the second control unit 22.
In der Verbindungsleitung 14 zwischen erstem Frequenzumrichter 16 und Elektromotor 12 ist eine Messvorrichtung 24 angeordnet, die die vom ersten Frequenzumrichter 16 in der Verbindungsleitung 14 generierte Motoreingangsspannung und/oder den von dem ersten Frequenzumrichter 16 in der elektrischen Verbindungsleitung 14 generierten Motoreingangsstrom und/oder die Motoreingangsspannung misst. In the connecting line 14 between the first frequency converter 16 and the electric motor 12, a measuring device 24 is arranged, which generated by the first frequency converter 16 in the connecting line 14 Motor input voltage and / or measured by the first frequency converter 16 in the electrical connection line 14 generated motor input current and / or the motor input voltage measures.
Die Messvorrichtung 24 ist über eine Messleitung 26 mit der Steuereinheit 22 verbunden, um das Messsignal, welches Informationen über die Frequenz und Höhe der Motoreingangsspannung und/oder des Motorstroms in der Leitung 14 enthält, an die Steuereinheit 22 des zweiten Frequenzumrichters 18 zu übertragen. The measuring device 24 is connected to the control unit 22 via a measuring line 26 in order to transmit the measuring signal, which contains information about the frequency and magnitude of the motor input voltage and / or the motor current in the line 14, to the control unit 22 of the second frequency converter 18.
Der Frequenzumrichter 18 mit der Steuereinheit 22 ist dazu ausgebildet, in der Verbindungsleitung 14 eine Motoreingangsspannung in Abhängigkeit von dem Messsignal der Messvorrichtung 24 zu generieren. Dadurch ist die in der Verbindungsleitung 14 zwischen zweitem Frequenzumrichter 18 und Elektromotor 12 anliegende Motoreingangsspannung des zweiten Frequenzumrichters 18 mit der in der Verbindungsleitung 14 zwischen erstem Frequenzumrichter 16 und Elektromotor 12 anliegenden Motoreingangsspannung des ersten Frequenzumrichters 16 synchronisiert. The frequency converter 18 with the control unit 22 is designed to generate a motor input voltage in the connecting line 14 as a function of the measuring signal of the measuring device 24. Characterized the voltage applied in the connecting line 14 between the second frequency converter 18 and electric motor 12 motor input voltage of the second frequency converter 18 is synchronized with the applied in the connecting line 14 between the first frequency converter 16 and electric motor 12 motor input voltage of the first frequency converter 16.
Dabei besteht keine direkte Verbindung zwischen den beiden Frequenzumrichtern 16, 18 und insbesondere nicht zwischen deren Steuereinheiten 20, 22. Jeder der beiden Frequenzumrichter 16, 18 erzeugt eine eigene, an einem jeweiligen Ende der Motorwicklungen des Elektromotors 12 anliegende Motoreingangsspannung. Dabei hat der erste Frequenzumrichter 16 keine Informationen über die Ausgangsspannung des zweiten Frequenzumrichters 18. Der zweite Frequenzumrichter 18 hat durch die Messvorrichtung 24 hingegen die Information, welche Motoreingangsspannung der erste Frequenzumrichter 16 generiert. There is no direct connection between the two frequency converters 16, 18 and in particular not between the control units 20, 22. Each of the two frequency converters 16, 18 generates its own, applied to a respective end of the motor windings of the electric motor 12 motor input voltage. In this case, the first frequency converter 16 has no information about the output voltage of the second frequency converter 18. By contrast, the second frequency converter 18 has the information which motor input voltage of the first frequency converter 16 is generated by the measuring device 24.
Mit der erfindungsgemäßen Verschaltung und Ansteuerung der beiden Frequenzumrichter 16, 18 mit einem Elektromotor 12 (oder auch mehreren Elektromotoren) zum Antrieb von Vakuumpumpen kann die in dem Elektromotor entstehende Verlustleistung reduziert werden. Der Elektromotor 12 wird dabei so verschaltet, dass bei gegebener Versorgungsspannung des jeweiligen Frequenzumrichters 16, 18 eine höhere Motoreingangsspannung als bei der herkömmlichen Verschaltung erzeugt wird. With the inventive interconnection and control of the two frequency converter 16, 18 with an electric motor 12 (or more Electric motors) for driving vacuum pumps, the power loss resulting in the electric motor can be reduced. The electric motor 12 is connected so that at a given supply voltage of the respective frequency converter 16, 18, a higher motor input voltage than in the conventional interconnection is generated.
Der Frequenzumrichter 16 ist ein herkömmlicher Frequenzumrichter beziehungsweise Wechselrichter zur Ansteuerung eines Elektromotors und beinhaltet die Steuerungs-bzw. Regelungsstruktur zur Ansteuerung und Regelung des Elektromotors. The frequency converter 16 is a conventional frequency converter or inverter for controlling an electric motor and includes the control or. Control structure for controlling and regulating the electric motor.
Die Besonderheit der Erfindung besteht darin, dass zwischen den beiden Steuereinheiten 20, 22 keine Datenverbindung zur Synchronisation der Frequenzumrichter 16, 18 besteht. Es kann lediglich eine Verbindung zu anderen Zwecken, zum Beispiel zur Statuserfassung und Fehlerbehandlung, bestehen. Die Synchronisation des zweiten Frequenzumrichters 18 auf das Drehfeld des ersten Frequenzumrichters 16 wird mittels der an den Elektromotor angeschalteten Messvorrichtung 24 ermöglicht. Die Messvorrichtung 24 besteht dabei nicht aus einem mechanischen Drehzahl- oder Lagegebersystem sondern ausschließlich aus einem Messsystem der elektrischen Ist-Werte der Spannung und/oder des Stromes in der Verbindungsleitung 14 am Elektromotor 12. The peculiarity of the invention is that there is no data connection between the two control units 20, 22 for the synchronization of the frequency converters 16, 18. It can only be a connection for other purposes, such as status tracking and error handling. The synchronization of the second frequency converter 18 to the rotating field of the first frequency converter 16 is made possible by means of the measuring device 24 connected to the electric motor. The measuring device 24 does not consist of a mechanical speed or position encoder system but exclusively of a measuring system of the electrical actual values of the voltage and / or the current in the connecting line 14 on the electric motor 12.
Durch die erfindungsgemäße Verschaltung der beiden Frequenzumrichter 16, 18 kann deren Ausgangsspannung bis zu 57 Prozent bei gleicher Netzversorgungsspannung mit Standardbauteilen (Frequenzumrichter, Messvorrichtung 24) erhöht werden. Dies ermöglicht eine Auslegung des Elektromotors 12 zu einer höheren Motorspannung oder eine Verringerung der Verlustleistung im Elektromotor 12 bei gleicher Antriebsleistung. The inventive interconnection of the two frequency converters 16, 18 whose output voltage can be increased up to 57 percent at the same power supply voltage with standard components (frequency converter, measuring device 24). This allows a design of the electric motor 12 to a higher motor voltage or a reduction of the power loss in the electric motor 12 with the same drive power.

Claims

Ansprüche claims
1. Vakuumpumpenantrieb mit einem den Rotor einer Vakuumpumpe antreibenden Elektromotor (12), einem ersten, mit dem Elektromotor (12) verbundenen Frequenzumrichter (16), der dazu ausgebildet ist, aus einer Netzversorgungsspannung eine den Elektromotor (12) antreibende Motoreingangsspannung zu generieren, mindestens einem zweitem Frequenzumrichter (18), der ebenfalls dazu ausgebildet ist, aus einer Netzversorgungsspannung eine Motoreingangsspannung variabler Frequenz zu generieren, um den Motor in Abhängigkeit von der Frequenz der Motoreingangsspannung anzutreiben, d a d u r c h g e k e n n z e i c h n e t , dass der zweite Frequenzumrichter (18) mit einer Messvorrichtung (24) versehen ist, die zur Messung der von dem ersten Frequenzumrichter (16) generierten Motoreingangsspannung und/oder des betreffenden Motoreingangsstroms versehen ist, um den zweiten Frequenzumrichter (18) mit dem ersten Frequenzumrichter (16) zu synchronisieren. A vacuum pump drive comprising an electric motor (12) driving the rotor of a vacuum pump, a first frequency converter (16) connected to the electric motor (12) and configured to generate a motor input voltage driving the electric motor (12) from a mains supply voltage a second frequency converter (18), which is likewise designed to generate a motor input voltage of variable frequency from a mains supply voltage in order to drive the motor in dependence on the frequency of the motor input voltage, characterized in that the second frequency converter (18) is connected to a measuring device (24). provided for measuring the motor input voltage generated by the first frequency converter (16) and / or the relevant motor input current in order to synchronize the second frequency converter (18) with the first frequency converter (16).
2. Vakuumpumpenantrieb, dadurch gekennzeichnet, dass zwischen den beiden Frequenzumrichtern (16, 18) keine Datenverbindung zur Synchronisation der Frequenzumrichter (16, 18) besteht. 2. Vacuum pump drive, characterized in that between the two frequency converters (16, 18) no data connection for synchronization of the frequency converter (16, 18).
3. Vakuumpumpenantrieb nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Messvorrichtung (24) den Strom und/oder die Spannung in der Verbindungsleitung (14) zwischen dem ersten Frequenzumrichter (16) und dem Elektromotor (12) misst. 3. Vacuum pump drive according to claim 1 or 2, characterized in that the measuring device (24) measures the current and / or the voltage in the connecting line (14) between the first frequency converter (16) and the electric motor (12).
4. Vakuumpumpenantrieb nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass jeder Frequenzumrichter (16, 18) eine eigene Steuereinheit (20, 22) zur Steuerung des betreffenden Frequenzumrichters aufweist, wobei keine Kommunikationsverbindung zwischen den Frequenzumrichtern (16, 18) zu deren Synchronisation besteht. 4. Vacuum pump drive according to one of the preceding claims, characterized in that each frequency converter (16, 18) has its own control unit (20, 22) for controlling the relevant frequency converter, wherein there is no communication connection between the frequency converters (16, 18) for their synchronization ,
5. Vakuumpumpenantrieb nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der zweite Frequenzumrichter (18) dazu ausgebildet ist, die Motoreingangsspannung in Abhängigkeit von den Messwerten der Messeinheit zu generieren. 5. Vacuum pump drive according to one of the preceding claims, characterized in that the second frequency converter (18) is adapted to generate the motor input voltage in dependence on the measured values of the measuring unit.
EP16819936.2A 2016-01-13 2016-12-23 Vacuum pump drive having two frequency converters Withdrawn EP3403326A1 (en)

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DE202016000217.2U DE202016000217U1 (en) 2016-01-13 2016-01-13 Vacuum pump drive with two frequency converters
PCT/EP2016/082569 WO2017121611A1 (en) 2016-01-13 2016-12-23 Vacuum pump drive having two frequency converters

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US20190028051A1 (en) 2019-01-24

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