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Journal of power electronics : JPE v.5 no.3, 2005년, pp.198 - 205  

Identification of the Mechanical Resonances of Electrical Drives for Automatic Commissioning

Pacas Mario    (Dept. of Power Electronics and Electrical Drives, University of Siegen   ); Villwock Sebastian    (Dept. of Power Electronics and Electrical Drives, University of Siegen   ); Eutebach Thomas    (Lenze Drives Systems GmbH  );
  • 초록

    The mechanical system of a drive can often be modeled as a two- or three-mass-system. The load is coupled to the driving motor by a shaft able to perform torsion oscillations. For the automatic tuning of the control, it is necessary to know the mathematical description of the system and the corresponding parameters. As the manpower and setup-time necessary during the commissioning of electrical drives are major cost factors, the development of self-operating identification strategies is a task worth pursuing. This paper presents an identification method which can be utilized for the assisted commissioning of electrical drives. The shaft assembly can be approximated as a two-mass non-rigid mechanical system with four parameters that have to be identified. The mathematical background for an identification procedure is developed and some important implementation issues are addressed. In order to avoid the excitation of the system with its natural resonance frequency, the frequency response can be obtained by exciting the system with a Pseudo Random Binary Signal (PRBS) and using the cross correlation function (CCF) and the auto correlation function (ACF). The reference torque is used as stimulation and the response is the mechanical speed. To determine the parameters, especially in advanced control schemes, a numerical algorithm with excellent convergence characteristics has also been used that can be implemented together with the proposed measurement procedure in order to assist the drive commissioning or to achieve an automatic setting of the control parameters. Simulations and experiments validate the efficiency and reliability of the identification procedure.


  • 참고문헌 (11)

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    4. Press, Flannery, Tenkolsky, Vetterling: Numerical Recipes, Cambridge University Press, 1986 
    5. J.-K. Ji, S.-K. Sui: Kalman Filter and LQ Based Speed Controller for Torsional Vibration Suppression in a 2-Mass Motor Drive System, IEEE Transactions on Industrial Electronics, vol. 42, no. 6, 1995 
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    9. H. Unbehauen, G. P. Rao: Identification of continuous systems, North Holland, 1987 
    10. J.O. Krah: Bode Plot based Auto-Tuning - Enahnced Solution for High Performance Servo Drives, PCIM 2004 Nuremberg, Germany 
    11. F. Schutte: Automatisierte Reglerinbetriebnahme in elektrischen Antrieben mit schwingungsfahiger Mechanik, Diss., University of Paderborn, 2002 

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