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METHOD FOR DETERMINING PARAMETER VALUES OF AN INDUCTION MACHINE BY MEANS OF POLYNOMINAL CALCULATIONS

  • US 20170075861A1
  • Filed: 12/01/2015
  • Published: 03/16/2017
  • Est. Priority Date: 09/14/2015
  • Status: Active Grant
First Claim
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1. A method for determining parameter values of an induction machine by means of polynomial calculations, as performed by a dedicated computer system, comprising:

  • sampling a voltage signal, a current signal and a rotational speed signal of the induction machine at the time the induction machine is started;

    calculating a resistance and a reactance of the induction machine at each of a plurality of slip rates according to the voltage signal and the current signal;

    calculating a plurality of coefficients of a polynomial fraction based on the resistances and the reactances;

    calculating parameter values of an equivalent circuit according to the plurality of coefficients of the polynomial fraction;

    calculating a moment of inertia and a friction coefficient of the induction machine according to the calculated parameter values and the rotational speed signal of the equivalent circuit; and

    outputting the moment of inertia and the friction coefficient of the induction machine.

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