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An algorithm for direct torque control of field oriented asynchronous motor drives

Ein Algorithmus zur direkten drehmomentregelung bei feldorientierten antrieben mit asynchronmotor

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Contents

The dynamic behaviour of fully digital control systems is strictly related to the duration of the sampling interval. The minimum length of this period depends exclusively on the time needed for the execution of all the required operations. Therefore, the minimization of computing time is one of the most important goals to be achieved in order to improve the accuracy of electrical drives with fully digitalized control systems. The best results can be obtained using fast programming languages and short sets of computing instructions. This goal is achieved using a proper feeding algorithm for asynchronous motor drives called “direct”, because it links directly the requested torque and magnetic flux to the input voltages.

Übersicht

Die Dynamik einer vollständig digitalen Regelung ist eng verbunden mit der Dauer des Abtast-Intervalles. Die Mindestdeuer der Periode hängt ausschließlich von der erforderlichen Rechenzeit ab. Deswegen ist die Minimierung der Rechenzeit eines der wichtigsten Ziele für die Genauigkeit elektrischer Antriebe mit vollständig digitaler Regelung. Die besten Ergebnisse können mit schnellen Programmiersprachen und kurzen Befehlssätzen erlangt werden. Das Ziel wird erreicht durch einen geeigneten Algorithmus für Asynchronmotoren. Dieser Algorithmus wird “direkt” genannt, weil er das elektromagnetische Moment und den magnetischen Fluss direkt mit den Eingangsspannungen verbindet.

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Abbreviations

i′r :

instantaneous value of the rotor currents symmetrical component referred to the stator

i s :

instantaneous value of the stator currents symmetrical component

l′ r :

rotor leakage inductance referred to the stator phase

l s :

stator phase leakage inductance

m :

number of stator phases

p :

pole-pairs number

r′ r :

rotor phase resistance referred to stator phase

r s :

stator phase resistance

v:

instantaneous value of the stator voltages symmetrical component

J, J m :

total and motor inertia

L m :

air-gap motor inductance

P :

rated power

T el :

motor electromagnetic torque

T L :

load torque

V R :

rated voltage

θ:

instantaneous rotor position

ω R :

rated angular speed

References

  1. Depenbrock, M.: Direct self-control (DSC) of inverter-fed induction machine. IEEE Trans. on Power Electronics. Vol. 3 No. 4 Oct. 1988

  2. Attaianese, C.; Del Pizzo, A.; Di Stefano, R.; Perfetto, A.: Microprocessor Predictive Control of inverter fed Asynchronous Motors. Proc. of PEMC-'94 Warsav (Poland). Sept. 1994

  3. Attaianese, C.; Perfetto A.: A Predictive algorithm for current control of inverter fed asynchronous motors ISIE-'93 Budapest (Hungary). June 1993

  4. Boldea, I.; Trica, A.: Torque Vector control (TVC) Voltage-fed induction motor drives-very low speed performance via sliding mode control. Proc. of ICEM Manchester (UK) 1990

  5. Habetler, T.; Profumo, F.; Pastorelli, M.; Tolbert, L. M.: Direct Torque Control of induction machines using space vector modulation. IEEE Trans. on Industry Applications. Vol. IA28, No. 5. Sept./Oct. 1992

  6. Attaianese, C.; Del Pizzo, A.; Marongiu, I.; Perfetto, A.: Microprocessor direct torque control of inverter fed asynchronous motors. 3rd International workshop on advanced motion control. Berkeley (USA). March 1994

  7. Wasko, C.: AC Drives in traction application. IEEE Trans. on Industry Applications Vol. IA-22, No. 5. Sept/Oct. 1986

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Authors and Affiliations

  1. Dipartimento Ingegneria Elettrica, Università di Napoli “Fedorico II”, Via Claudio 21, I-80125, Napoli, Italy

    G. Celentano, A. Del Pizzo, M. L. Grassi & E. Pagano

Authors
  1. G. Celentano
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  2. A. Del Pizzo
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  3. M. L. Grassi
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  4. E. Pagano
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Celentano, G., Del Pizzo, A., Grassi, M.L. et al. An algorithm for direct torque control of field oriented asynchronous motor drives. Electrical Engineering 79, 277–281 (1996). https://doi.org/10.1007/BF01245879

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  • DOI: https://doi.org/10.1007/BF01245879

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