[go: up one dir, main page]

WO1999003193A1 - Procede pour commander un moteur electrique - Google Patents

Procede pour commander un moteur electrique Download PDF

Info

Publication number
WO1999003193A1
WO1999003193A1 PCT/EP1998/004154 EP9804154W WO9903193A1 WO 1999003193 A1 WO1999003193 A1 WO 1999003193A1 EP 9804154 W EP9804154 W EP 9804154W WO 9903193 A1 WO9903193 A1 WO 9903193A1
Authority
WO
WIPO (PCT)
Prior art keywords
voltage
motor
frequency ratio
frequency
efficiency
Prior art date
Application number
PCT/EP1998/004154
Other languages
German (de)
English (en)
Inventor
Hellmut Lorenz
Original Assignee
Barmag 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 Barmag Ag filed Critical Barmag Ag
Publication of WO1999003193A1 publication Critical patent/WO1999003193A1/fr

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
    • H02P27/047—V/F converter, wherein the voltage is controlled proportionally with the frequency

Definitions

  • the invention relates to a method for controlling an electric motor for small units, in particular in a texturing machine.
  • the small units for example a texturing machine known from DE 33 24 243, are driven by electric motors.
  • Small units are, for example, the friction false twister, the traversing device, the rewinder and the delivery units.
  • the electric motors which can be designed as asynchronous motors, for example, are each individually controlled in order to bring about corresponding speeds. Due to the different thread types, each of the drives must cover a relatively large speed range. When processing threads with large titers, the drives are set in the machine at correspondingly low speeds. In the case of large thread titers, however, high torque is also required from the electric motor, for example on the false twist unit. On the other hand, a relatively low torque is required when processing threads with a low titer, but this must be given off by the motor at higher speeds.
  • the motors are usually designed for a design point with optimal utilization, which is characterized by the nominal speed.
  • This design point of the motor is characterized by a voltage-frequency ratio that results from the mains voltage and the mains frequency.
  • the motor characteristics such as the torque can be influenced by this voltage-frequency ratio.
  • the invention now makes use of the knowledge that each voltage-frequency ratio has characteristic motor characteristics. At an operating point, the voltage-frequency ratio is therefore changed according to the invention at a constant frequency in such a way that the motor with optimal utilization, i.e. is operated with the most favorable efficiency for the operating point.
  • the frequency that determines the speed of the motor remains unchanged during the change in the voltage frequency ratio.
  • the change is made solely by changing the voltage, for example by changing the setting of a converter.
  • the favorable voltage-frequency ratio determined by iteration is then maintained for the respective operating point. In this way, the power consumption of the motor can be minimized. In a machine with numerous individual drives in particular, this leads to considerable energy savings.
  • This method is particularly advantageous in order to be able to operate small motors in the power range of ⁇ 1 KW with optimal utilization, since the efficiency curve of a small motor has a particularly strong peak.
  • the optimization of the operating point is carried out after a steady state of a new process setting has been reached. Since the thread parameters do not change significantly during the process, there is no constant need New hiring. Only after a change to another thread type has been carried out, a new optimization of the drive is carried out at the respective operating point when the process starts again.
  • the slip of the electric motor will change.
  • the method variant according to claim 2 is particularly advantageous here in order to adjust the frequency in a further step to maintain a target speed of the engine. This ensures that the electric motor maintains the desired speed at the operating point with optimum efficiency. Since the frequency / frequency ratio also changes as the frequency changes, the efficiency of the electric motor is preferably optimized again after the target speed has been adjusted. With this method variant, two iterative methods are thus carried out in succession and repeatedly.
  • the method variant according to claim 3 is advantageous.
  • the change in the voltage-frequency ratio is carried out in both directions by increasing and / or reducing the voltage. This allows the slip to be optimized in relation to the target engine speed.
  • the method variant according to claims 4 and 5 is particularly advantageous in order to quickly reach the optimal range with a strongly developed characteristic curve of the engine. This makes it possible to first find an optimal area in order to then determine the optimal efficiency in fine optimization with a small increment.
  • a power consumed by the motor is measured at the respectively predetermined voltage-frequency ratio. As a result, the efficiency can be determined solely from the powers measured during the iteration. If the power has decreased due to a change in the voltage-frequency ratio, the voltage changes in the same direction until the minimum power is reached. If the power increases with a given change in voltage, the direction of change must be changed.
  • a current drawn by the motor is measured and compared with the respective output value. If the current decreases compared to the initial value, the voltage-frequency ratio changes further in the same direction until a minimum of the current is reached.
  • the 1 shows a diagram with the current and torque characteristics of an electric motor. This is an asynchronous motor. The speed is plotted on the abscissa. The speed n is given as a percentage of the synchronous speed.
  • the torque M emitted by the motor and the current I absorbed by the motor are plotted on the ordinate.
  • the torque characteristic M denotes the torque delivered by the engine.
  • the current characteristic curve I characterizes the current drawn by the motor. Both characteristics apply to a specific voltage-frequency ratio of the motor. That at The nominal torque occurring is denoted by M N and the current drawn by the motor at the nominal speed is denoted by I N.
  • the nominal torque is generated by the motor when S slips.
  • the slip is the deviation between the nominal speed and the synchronous speed. The slip is greater the more the motor is loaded, ie the higher the torque required by the motor.
  • the torque characteristic U j corresponds to the torque delivered by the motor at a voltage-frequency ratio with the voltage U j and a predetermined constant frequency.
  • the speed selected at the operating point is determined by the frequency. This speed is registered with n set in the diagram.
  • the torque characteristic curve U denotes the torque delivered by the motor in a voltage-frequency ratio with the voltage U and the U ISIN line 3, the torque output from the motor at a voltage to frequency characteristic with the voltage U. 3
  • the frequency is constant.
  • FIG. 3 is a diagram with the efficiency of the engine from FIG. 2 shown. Depending on the changed voltage-frequency relationships, there are different efficiency curves Ui, U 2 and U 3 . With reference to FIG. 2 it is shown in FIG. 3 that the torque Mi, which is delivered at the speed n, leads to an efficiency ⁇ y, the motor.
  • the voltage-frequency ratio is now changed by changing the voltage at a constant frequency.
  • the voltage Ui is increased to the voltage U 2 .
  • the speed n 2 in conjunction with the efficiency characteristic U 2 leads to an efficiency ⁇ 2 .
  • the comparison between the efficiencies rji to ⁇ 2 leads to the result that ⁇ 2 is greater than r /,. ⁇ ? ⁇ corresponds to the efficiency rj before , and the efficiency ⁇ 2 corresponds to the efficiency rj n ac -
  • the next step is to further increase the voltage.
  • This results in the torque characteristic U 3 which is obtained with a voltage-frequency ratio with a voltage U 3 .
  • the torque Mi is output by the engine at the operating point at a speed n 3 .
  • the rotational speed n 3 results in the underlying efficiency curve U 3 to an efficiency rj. 3
  • the efficiency r 3 is less than ⁇ 2 .
  • ⁇ 2 is the efficiency i7 before
  • ⁇ 3 corresponds to the efficiency ⁇ after .
  • the change in the voltage-frequency ratio has led to a deterioration in the efficiency.
  • the output value of the voltage-frequency ratio is set at the operating point that existed before the change.
  • the motor is operated with the voltage U 2 at the operating point identified by the torque Mi.
  • the slip results from (v ⁇ - n 2 ).
  • the power output by the engine is characterized by the required torque.
  • the torque is essentially constant at the operating point, so that the power output is also constant.
  • the efficiency can thus be determined by directly measuring the power consumed by the motor or the current consumed by the motor. To optimize efficiency, the power or current consumed must therefore be minimized.
  • the motor is then controlled by an iterative power measurement or current measurement for the purpose of power or current minimization.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

L'invention concerne un procédé pour commander un moteur électrique destiné à de petits organes, notamment dans une machine à texturer. On détermine pour un rapport tension-fréquence prédéfini le rendement correspondant. Une optimisation du rendement est réalisée par variation itérative du rapport tension-fréquence, à fréquence constante et pour un point de fonctionnement dynamique. Le moteur est mû, à ce point de fonctionnement dynamique, avec le rapport tension-fréquence ayant abouti au rendement le plus élevé.
PCT/EP1998/004154 1997-07-11 1998-07-06 Procede pour commander un moteur electrique WO1999003193A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19729668 1997-07-11
DE19729668.8 1997-07-11

Publications (1)

Publication Number Publication Date
WO1999003193A1 true WO1999003193A1 (fr) 1999-01-21

Family

ID=7835347

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1998/004154 WO1999003193A1 (fr) 1997-07-11 1998-07-06 Procede pour commander un moteur electrique

Country Status (1)

Country Link
WO (1) WO1999003193A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1013420C2 (nl) * 1999-10-29 2001-05-02 Vostermans B V A Werkwijze en inrichting voor het regelen van het toerental van een elektromotor.
WO2003088470A1 (fr) * 2002-04-16 2003-10-23 Metabowerke Gmbh Machine-outil electronique
EP1702404A1 (fr) * 2004-01-05 2006-09-20 Weg S.A. Convertisseur de frequence statique a fonction automatique d'optimisation du flux magnetique et de reduction au minimum des pertes dans des moteurs a induction electrique
WO2018049074A1 (fr) * 2016-09-08 2018-03-15 Limiter Power Management System (PTY) LTD. Commande de moteur à induction efficace

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4477761A (en) * 1981-12-09 1984-10-16 Zinser Textilmaschinen Gmbh Method of and system for minimizing current consumption of one or more A-C motors driving a variable load
EP0698962A1 (fr) * 1994-08-25 1996-02-28 Matsushita Electric Industrial Co., Ltd. Commande d'onduleur
US5548199A (en) * 1992-12-30 1996-08-20 L'unite Hermetique Optimal power supply for an electric motor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4477761A (en) * 1981-12-09 1984-10-16 Zinser Textilmaschinen Gmbh Method of and system for minimizing current consumption of one or more A-C motors driving a variable load
US5548199A (en) * 1992-12-30 1996-08-20 L'unite Hermetique Optimal power supply for an electric motor
EP0698962A1 (fr) * 1994-08-25 1996-02-28 Matsushita Electric Industrial Co., Ltd. Commande d'onduleur

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1013420C2 (nl) * 1999-10-29 2001-05-02 Vostermans B V A Werkwijze en inrichting voor het regelen van het toerental van een elektromotor.
WO2003088470A1 (fr) * 2002-04-16 2003-10-23 Metabowerke Gmbh Machine-outil electronique
US7268509B2 (en) 2002-04-16 2007-09-11 Metabowerke Gmbh Electric driven tool device
EP1702404A1 (fr) * 2004-01-05 2006-09-20 Weg S.A. Convertisseur de frequence statique a fonction automatique d'optimisation du flux magnetique et de reduction au minimum des pertes dans des moteurs a induction electrique
WO2018049074A1 (fr) * 2016-09-08 2018-03-15 Limiter Power Management System (PTY) LTD. Commande de moteur à induction efficace

Similar Documents

Publication Publication Date Title
DE3330028C2 (fr)
DE69604896T2 (de) Umrichter für eine Leuchtstoffröhre mit kalten Kathoden mittels eines piezoelektrischen Wandlers
DE69424193T2 (de) Durch einen Motor angetriebener Schweisseinrichtungsgenerator
DE2914595A1 (de) Einrichtung zum steuern bzw. regeln des drehmoments eines wechselstrommotors
EP2474089A2 (fr) Procédé et circuiterie pour détecter la charge d'un moteur, sans capteur, et pour réguler l'intensité en fonction de la valeur de la charge dans des moteurs pas-à-pas
DE102015223365A1 (de) Verfahren zur Ermittlung eines d- und q-Stromes zur Ansteuerung einer permanenterregten Synchronmaschine
WO1999003193A1 (fr) Procede pour commander un moteur electrique
CH664460A5 (de) Verfahren und einrichtung zum verringern der leistungsaufnahme einer elektrischen antriebsanordnung.
EP2506666B1 (fr) Dispositif d'appareil de cuisson
EP0771065A1 (fr) Procédé pour le démarrage d'un entraînement électrique à vitesse de rotation variable
DE1538366B1 (de) Schaltungsanordnung zur sollwert nstellung fuer e fre quenzabhaengigen drehzahlen mehrerer in einem festen ein stellbaren dreh hlverhaeltnis zueinander stehender wechselstrommotoren
DE60019850T2 (de) Regelungsverfahren für einen geschalteten Reluktanzmotor und Reluktanzmotor mit geringem Spitzenstrom
EP0397818B1 (fr) Procede et dispositif pour modifier la valeur effective de la vitesse de rotation d'un moteur asynchrone polyphase et systeme de moteurs convenant pour la mise en uvre de ce procede
DE69511971T2 (de) Spannung-, Phase- und Frequenzsteuerung für ein Miniatur-Wechselrichtersystem
DE3687725T2 (de) Steuerungsvorrichtung fuer umrichter.
DE2634212C2 (de) Schaltungsanordnung zur Drehzahlregelung eines Gleichstrommotors
EP2192685B1 (fr) Dispositif et procédé d'autoparamétrage d'un appareil de commande de moteur électronique
DE69807090T2 (de) Verfahren zum spannen von schraubverbindungen
DE60012406T2 (de) Verfahren und Vorrichtung zur automatischen Regelung eines Asynchronmotors zum Antrieb des Fadenzuführungsrohrs in Liefervorrichtungen für Textilmaschinen
AT519142B1 (de) Verfahren und Vorrichtung zum Abbauen elastisch gespeicherter Energie
EP1022845A2 (fr) Procédé et dispositif de commande une moteur éléctrique d'un broyeur à documents
WO2022128508A1 (fr) Procédé et appareil de commande d'un onduleur
DE4242665A1 (de) Verfahren und Vorrichtung zum Rückschalten eines polumschaltbaren Motors
DE19535676A1 (de) Verfahren zur Leistungssteuerung eines Induktionsmotors
DE3506651A1 (de) Wechselstrommotor

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): CN DE JP KR TR US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE

121 Ep: the epo has been informed by wipo that ep was designated in this application
DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
NENP Non-entry into the national phase

Ref country code: KR

REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

122 Ep: pct application non-entry in european phase