The Calculation of the Dynamic Behavior of Electric Machines by Space-Phasors

Naunin, Dietrich

doi:10.1080/07313567908955358

Cited by 11 publications

(4 citation statements)

References 3 publications

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“…Figure 3 a shows the speed oscillations during the run-up and after the switching due to oscillating torques. The peak torque after the switching is 2.9 times rated torque which is more than double the [1,2]. They arise from the oscillation of the flux with slip frequency.…”

Section: 1 Slar-delta-switching After Run-upmentioning

confidence: 94%

Star-delta switching performance during the starting of an induction motor

Naunin

1981

Archiv f. Elektrotechnik

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Contents:During the starting of all inductiotl motor currents are very high. Through the switching of the windings from a star-to a delta-configuration the currents are diminished. But there are high current and torque transients shortly after the switching moment. These transients are dependent on the type of the star-delta-connections and on the switching moment during the run-up. This paper presents a thorough investigation of these dependencies and the resulting current and torque performance. Optimal switching moments will be discussed. The calculations are based on the presentation of the behaviour of the induction motor by space-phasors and is done by digital simulation on a computer. Great importance is put on a physical interpretation of the results. Stern-Dreieck Umschaltung wiihrend des Hochlaufs einer AsynchronmaschineObersicht: "vVXhrend des Hochlaufs eines Asynchronnlotors flieBen hohe Str6me. Diese k6nnen durch eine Stern-DreieckUmschaltung der Wicklungen verringert werden, Kurz nach dem Umschaltaugenblick entstehen jedoch hohe Strom-und Drehmomentspitzen. Diese Spitzen sin dabhgngig yon der Art der, Stern-Dreieck-Umschaltkonfiguration nnd yore Schaltaugenblick wSohrend des Hoehlaufs. Der Aufsatz beschreibt eingehend diese Abh/ingigkeiten nnd das dabei entstehende Strom-und Drehmomentverhalten. Es werden optimale Umschaltzeitpunkte diskutiert. Die ~3ereehnungen beruhen auf der Darstellung des Asynchronmotor-Verhaltens dutch Raumzeiger und wurden mit einem digitalen Simulationsprogramnl durchgefEhrt. Besonderer Wert wurde auf die physikalische Interpretation der Ergebnisse gelegt.Commonly the star-delta-switching is applied by which the currents are cut down to 2 to 3 times rated current. But after the switching again there are high current peaks. Therefore an investigation is necessary to find out whether there are optimal moments of switching and whether there can be a strategy for an optimal performance during the starting. Basic Equations for the Dynamic Behaviour of an Induction MotorIn previous papers El, 2] the presentation of the dynamic behaviour of an induction motor by spacephasors has been derived. Space-phasors give a very good picture and understanding of the physical processes inside the machine since the space-phasors of flux and current --being complex variables in a complex plane placed in the crossection of the machine --represent the rotating fieId and the current distribution by amplitude and position in the air gap of the machine. The current space-phasor for instance is defined by

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Section: 1 Slar-delta-switching After Run-upmentioning

confidence: 94%

Star-delta switching performance during the starting of an induction motor

Naunin

1981

Archiv f. Elektrotechnik

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“…2). Datorită semnificației fizice a metricii sale (lungime și orientare)congruente cu valoarea instantanee și poziția unghiulară polară instantanee ale amplitudinii (valorii maxime pozitive) undei plane progresive (învârtitoare) a solenației rezultante a înfășurării trifazate statorice din planul secțiunii transversale a mașinii de inducție bipolare trifazatesegmentul (de dreaptă) orientat (vectorul legat), de afix, j ( ) ( ) ( ) e s t ss i t i t   = , din planul complex confundat cu planul secțiunii transversale a mașinii este denumit fazor spațial, prin traducerea din limbile germană și engleză a expresiilor corespondente ('Raumzeiger', respectiv, 'space phasor') introduse și justificate conceptual în lucrările de referință [1], [2].…”

Section: Modelul Dinamic îN Fazori Spațiali Reprezentativi Al Subsist...unclassified

On the Representative Space Phasor Concept From the Dynamic Model of the Three-Phase Induction Machine

RĂDULESCU¹

2023

APME/EMMD

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In the paper, based on the linear dynamic behavior models of the electrical and magnetic subsystems of the induction machine with three-phase symmetrical stator winding and polyphase rotor winding (cage type) in short circuit, the values are represented, in the complex plane confused with the cross-sectional plane of the machine and the instantaneous polar angular positions of the amplitudes of the progressive (spinning) plane waves of the instantaneous resultant solenations of the machine windings, and correspondingly, the spatial phasors representative of the instantaneous electrical circuit scalar quantities of the stator phase windings and rotor equivalents of the machine are defined. The metric (length and orientation) of these representative spatial phasors allows their physical significance to be revealed.

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“…The significance of the space vector for the calculation of electromagnetic quantities and for the identification of the operating conditions of electric machinery was well established during the 60's and the 70's [1], [6], [7], [8].…”

Section: B Current Space Vector Analysismentioning

confidence: 99%

Space vector feature extraction for condition monitoring of the slip energy recovery drive

Tsoumas

Safacas

2005

2005 International Conference on Electrical Machines and Systems

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Mechanical imbalance and eccentricity are usual faults in induction motors. These two faults can be identified by their effects in the stator current spectrum using motor current signature analysis. However, if the motor is supplied by electronic converters the identification of the fault is more complex, since additional harmonic components appear, caused by the converter. The main objective of the present work is to investigate the possibility of identifying these faults in a motor which is supplied by a power converter, specifically the slip energy recovery drive. To this purpose, the rotor current space vector modulus harmonic components are examined. The system is at first investigated through simulation in Matlab-Simulink. Thereafter, experimental tests are conducted. Characteristic results are presented and discussed.

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The Calculation of the Dynamic Behavior of Electric Machines by Space-Phasors

Cited by 11 publications

References 3 publications

Star-delta switching performance during the starting of an induction motor

Star-delta switching performance during the starting of an induction motor

On the Representative Space Phasor Concept From the Dynamic Model of the Three-Phase Induction Machine

Space vector feature extraction for condition monitoring of the slip energy recovery drive

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